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How much electrical energy does a 40w light bulb use if it is left on for 12h?
Wiki User
∙ 10y ago
75W means bulb which give 75W power when connected to domestic light. Power is nothing but energy per second. Thus energy consumed by bulb can be calculated as follows.
E = 75*60*60*4J = 1080kJ
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoA light bulb has an efficiency of 10%. A 40 watt light bulb gives off 4 watts of light. That leaves 36 watts of heat. Now you can look up the formula to get the conversion factor to joules so you can get the right answer for your homework.
Wiki User
∙ 10y agoUse the formula: energy = power x time.
First you must convert everything to appropriate units. Here is the same equation as above, but with compatible units:
joules = watts x seconds
or
kilowatt-hours = kilowatts x hours
Wiki User
∙ 12y ago40w=.04kWh
.04*12 hours=
.48 kWh
Wiki User
∙ 14y ago40 watt hours or .04 kWh
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How much energy will a 100w light bulb convert to light and heat if it is left burning for 1hour?
Power = Energy/time 100W=Energy/360 Seconds Energy = 100/360 Energy ≈ 0.27 Joules
How much energy does a 100 watt light bulb use if it is left on all day?
100watts x 24 hours
Which of the 10 forms of energy does electrical energy use?
I wouldn't say that electrical energy "uses" other types of energy; probably you mean that you can convert other types of energy to electrical energy. Most types of energy can be converted to electrical energy, or actually all of them (as long as there is some useful energy left) - including heat energy, nuclear energy, chemical energy, mechanical energy, etc.
How much eletrical energy energy in kilowat hours would 60 w light bulb use un 60 sdays if left on steadily?
60 days is 24x60 hours, so the energy used is 60x24x60 watt-hours, 86400 watt-hours or 86.4 kilowatt-hours or units. If it is a 60-watt incandescent bulb it could be replaced by a 12 watt low-energy bulb, and in the same time that would use only 17.3 units, saving 69 units costing about £10.
Why is the light energy written on the left of the equation?
because of glucose
What causes a Ford LEFT turn signal to flash fast no left turn rear light no rear left brake light?
The turn signal and brake light use the same bulb. When you get a fast flash, it is from a reduced electrical load being placed on the flasher unit due to a burned bulb. Replace the bulb and this should fix your problem.
How much energy will a 100w light bulb convert to light and heat if it is left burning for 1hour?
Power = Energy/time 100W=Energy/360 Seconds Energy = 100/360 Energy ≈ 0.27 Joules
How much energy does a 100 watt light bulb use if it is left on all day?
100watts x 24 hours
Does a 60 watt light bulb evaporate water faster than the sun?
Faster than ambient left alone? If compare to open air then it is faster with extra heat source of 100 Watt. If it had twice the bulb then it is faster than 1 bulb. Light bulb is the energy source and evaporation require energy. Provide extra energy help speed up evaporation.
My rear left tail light is not working on camper?
You should try changing the light bulb... if that doesnt work, then there might be a short in the wiring, and will need to be looked at by someone who knows electrical wiring.
How much energy does a 120 watt light bulb use if it is left on for 36 gours?
120 watt * 36 hr = 4,320 watts
Why my Left brake light will not come on?
Have you tried changing the bulb ? maybe the bulb is bad
Right stop light not work left stop light works?
The bulb is burned out
How do you remove front left head light to change bulb?
HOW DO I CHANGE LIGHT BULBS
Why do your left rear tail light and blinker not work on your 1997 suburban?
Bulb is blown. Replace bulb.
How does the Sun shine for years at a time without burning out like a light bulb?
Quite simply, this is because the Sun isn't a light bulb. The Sun is a hot gas - hot plasma, to be more precise - and it gets its energy from nuclear fusion at its center. There is enough energy left to continue burning for several billion years more.
How do you take a light bulb out of the socket?
TUrn the light off and let the bulb cool for a short while. Then just twist it counterclockwise (to the left) to remove it.
